rolepowerdao.java

一个jsp的oa系统,里面有很多亮点学习!

package com.oa.lp.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class RolePowerDAO {
	private Connection conn;
	public Connection getConn() {
		return conn;
	}

	public void setConn(Connection conn) {
		this.conn = conn;
	}
	/**
	 * 删除角色所有权限
	 * @throws SQLException 
	 */
	public void delRolePower(int roleId) throws SQLException{
		String sql = "delete from SYS_ROLE_POWER where ROLE_ID=?";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1,roleId);
		pstmt.executeUpdate();
		pstmt.close();
	}
	
	/**
	 * 为角色分配权限
	 * @throws SQLException 
	 */
	
	public void addRolePower(int roleId,String powerIds[]) throws SQLException{
		String sql = "insert into SYS_ROLE_POWER(ROLE_ID,POWER_ID) VALUES(?,?)";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		for(int i=1;i<powerIds.length;i++){
			pstmt.setInt(1,roleId);
			pstmt.setInt(2,Integer.parseInt(powerIds[i]));
			pstmt.executeUpdate();
		}
		pstmt.close();
	}
	
	/**
	 * 通过角色查找角色下的所有权限
	 * @throws SQLException 
	 */
	public List getPowersByRoleId(int roleId) throws SQLException{
		List list = new ArrayList();
		String sql="select *from SYS_ROLE_POWER where ROLE_ID=?";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1,roleId);
		ResultSet rs = pstmt.executeQuery();
		while(rs.next()){
			int powerId = rs.getInt("POWER_ID");
			list.add(String.valueOf(powerId));
		}
		return list;
	}
}